US20040051784A1 - Electronic camera - Google Patents

Electronic camera Download PDF

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Publication number
US20040051784A1
US20040051784A1 US10/380,328 US38032803A US2004051784A1 US 20040051784 A1 US20040051784 A1 US 20040051784A1 US 38032803 A US38032803 A US 38032803A US 2004051784 A1 US2004051784 A1 US 2004051784A1
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US
United States
Prior art keywords
image
derivative
original image
unit
mpu
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/380,328
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English (en)
Inventor
Satoshi Ejima
Kazuya Umeyama
Takumi Kawahara
Toshihisa Kuroiwa
Toshiaki Kobayashi
Hirotake Kobayashi
Tomoaki Kawamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nikon Corp
Original Assignee
Nikon Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001213524A external-priority patent/JP4608824B2/ja
Priority claimed from JP2001216814A external-priority patent/JP4608825B2/ja
Priority claimed from JP2001245954A external-priority patent/JP4356272B2/ja
Application filed by Nikon Corp filed Critical Nikon Corp
Assigned to NIKON CORPORATION reassignment NIKON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: EJIMA, SATOSHI, KAWAHARA, TAKUMI, KAWAMURA, TOMOAKI, KOBAYASHI, TOSHIAKI, KUROIWA, TOSHIHISA, NOZAKI, HIROTAKE, UMEYAMA, KAZUYA
Publication of US20040051784A1 publication Critical patent/US20040051784A1/en
Priority to US12/071,670 priority Critical patent/US20090009629A1/en
Priority to US12/929,010 priority patent/US8547469B2/en
Abandoned legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/765Interface circuits between an apparatus for recording and another apparatus
    • H04N5/77Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera
    • H04N5/772Interface circuits between an apparatus for recording and another apparatus between a recording apparatus and a television camera the recording apparatus and the television camera being placed in the same enclosure
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/765Interface circuits between an apparatus for recording and another apparatus
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/907Television signal recording using static stores, e.g. storage tubes or semiconductor memories
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/91Television signal processing therefor
    • H04N5/92Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N5/9201Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal
    • H04N5/9205Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving the multiplexing of an additional signal and the video signal the additional signal being at least another television signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/804Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components
    • H04N9/8042Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback involving pulse code modulation of the colour picture signal components involving data reduction
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/79Processing of colour television signals in connection with recording
    • H04N9/80Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback
    • H04N9/82Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only
    • H04N9/8205Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal
    • H04N9/8227Transformation of the television signal for recording, e.g. modulation, frequency changing; Inverse transformation for playback the individual colour picture signal components being recorded simultaneously only involving the multiplexing of an additional signal and the colour video signal the additional signal being at least another television signal

Definitions

  • the present invention relates to an electronic camera which generates derivative images for external transfer from captured original images.
  • the present invention particularly relates to an image managing technology, an image displaying technology, and a user interface technology for these derivative images.
  • Images generated in an electronic camera are outputted to a personal computer, a printer, a mass memory unit, a cellular phone, a digital photograph server on the Internet, and so on when necessary.
  • a cellular phone or the like handles images with an extremely lower pixel density compared with that of images handled by a personal computer, a printer, and the like. Therefore, in a case where an image with substantially the same pixel density as images used with a personal computer or a printer is transferred to a cellular phone, the cellular phone cannot receive the image because the image data exceeds its data capacity, resulting in data loss.
  • the derivative image and its original image from which the derivative image is generated both exist in a recording unit of the electronic camera.
  • An electronic camera of the present invention includes: an imaging unit for capturing a subject to generate an original image; a derivative image generating unit for reducing resolution or color of the original image to generate derivative image(s) for transfer; a recording unit recording the original image and the derivative image thereon in such a manner that the original image the derivative image get associated with each other; and a transfer unit transferring the derivative image recorded on the recording unit to an external transfer destination.
  • the derivative image (or original image) can be specified by utilizing its association with its original image (or derivative image). This can realize comprehensive image management of the original image and the derivative image with ease based on the original-derivative image associations.
  • the recording unit manages the derivative image (or original image) in the same way as it manages its original image (or derivative image) by making use of the associations described above. This eliminates the necessity of separately managing the original image and the derivative image.
  • the recording unit of the electronic camera in the above description (1) includes: a folder in which the original image is recorded; and lower folders being under the folder hierarchically and in which the derivative images are separately recorded depending on their respective image sizes, in order to manage the derivative images by size in a hierarchical manner.
  • Such hierarchical management enables appropriate image management of the original image and the derivative image.
  • using the lower folders exclusively for storing the derivative images can prevent a user from mistakenly storing the original image in the lower folders, thereby enabling accurate discrimination between the original image and the derivative image in image management.
  • the transfer unit of the electronic camera in the above description (1) obtains information on the external transfer destination from the external transfer destination or a user, and the derivative image generating unit determines an image format corresponding to the information on the external transfer destination to generate a derivative image according to the image format.
  • the electronic camera in the above description (1) further includes an erase control unit for receiving an erase command for the original image from a user.
  • the recording unit erases the original image in compliance with the erase command, and then retrieves and erases a recorded derivative image which is associated with the original image.
  • the recording unit of the electronic camera in the above description (1) erases a derivative image which has been transferred by the transfer unit. Structuring the electronic camera in this way eliminates a disadvantage that externally transferred derivative images remain in the electronic camera.
  • Another electronic camera of the present invention is configured such that the electronic camera in the above description (1) additionally includes a storage space monitoring unit for determining an available storage space of the recording unit and finding a shortage in the available storage space.
  • the recording unit erases all or a part of the derivative images when the storage space monitoring unit finds a shortage in the available storage space.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a transfer control unit for receiving from a user a file transfer command for the original image, and the recording unit file-transfers the original image in compliance with the file transfer command and retrieves, for file-transfer, a derivative image which has been recorded in association with original image.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a protect control unit for receiving from a user a protect command for the original image, and the recording unit sets a protect attribute on the original image in compliance with the protect command, and retrieves a derivative image which has been recorded in association with the original image to set the protect attribute on this derivative image.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes an original image erase control unit for receiving only an erase command for the original image from a user, in which the recording unit erases the original image in compliance with the erase command, and retrieves a derivative image which has been recorded in association with the original image, and upgrades this derivative image to the original image.
  • an original image erase control unit for receiving only an erase command for the original image from a user, in which the recording unit erases the original image in compliance with the erase command, and retrieves a derivative image which has been recorded in association with the original image, and upgrades this derivative image to the original image.
  • the recording unit preferably upgrades a derivative image of the largest image size to an original image when a plurality of corresponding derivative images is present. Moreover, it is preferable that the recording unit records the original image to which the derivative image has been upgraded, in association with remaining derivative images.
  • Another electronic camera of the present invention is characterized in that the imaging unit of the electronic camera in the above description (1) selectively has a moving image capture mode in which a subject is captured as moving images, and the derivative image generating unit generates, for the original image captured in the moving image capture mode (namely, moving images), a derivative image by reducing resolution or color of one frame of the original image.
  • the imaging unit of the electronic camera in the above description (1) selectively has a moving image capture mode in which a subject is captured as moving images
  • the derivative image generating unit generates, for the original image captured in the moving image capture mode (namely, moving images), a derivative image by reducing resolution or color of one frame of the original image.
  • Such generation of the derivative image from one frame of the moving images enables reduction in processing load taken for generating the derivative image from the moving images. It is also made possible that captured moving images are not transferred immediately after the capture, but only one frame of the derivative image is transferred for a trial instead.
  • Another electronic camera of the present invention is characterized in that the imaging unit of the electronic camera in the above description (1) selectively has a continuous capture mode in which a subject is captured as continuous static images, in which the derivative image generating unit generates, for an original image captured in the continuous capture mode (namely, plural static images), derivative images (namely, plural static images) by reducing resolution or color of each frame of the original image.
  • the imaging unit of the electronic camera in the above description (1) selectively has a continuous capture mode in which a subject is captured as continuous static images, in which the derivative image generating unit generates, for an original image captured in the continuous capture mode (namely, plural static images), derivative images (namely, plural static images) by reducing resolution or color of each frame of the original image.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a thumbnail generating unit generating a thumbnail image for thumbnail display from the original image and appending the generated thumbnail image to the original image, and the thumbnail generating unit does not append the thumbnail image to the original image when the number of pixels of the thumbnail image is equal to or larger than the number of pixels of the derivative image.
  • Not appending the thumbnail image to the original image can reduce the file size of the original image properly.
  • the derivative image is preferably used in place of the thumbnail image in the case of not appending the thumbnail to the original image as described above.
  • Another electronic camera of the present invention includes: an imaging unit for capturing a subject to generate an original image; a derivative image generating unit for reducing resolution or color of the original image to generate a derivative image for transfer; a recording unit recording the original image and the derivative image thereon; a transfer unit transferring the derivative image recorded on the recording unit to an external transfer destination; and a control unit erasing from the recording unit a derivative image which has been transferred to exterior by the transfer unit.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a display unit displaying an image or information on the image, wherein the display unit discriminates between the original image and the derivative image and decides the derivative image as non-display.
  • not displaying (hiding) the derivative image on the screen makes it possible to prevent, with sureness, the user from being confused because the original image and the derivative image being the same image appear on the screen.
  • deciding the derivative image as non-display reduces the number of images to be displayed. This enables the user to quickly find a target image from a small number of display images.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a display unit displaying an image or information on the image, and the display unit displays information on the image size of the derivative image in addition to the derivative image.
  • Such a structure of the electronic camera enables the user to accurately distinguish the original image and the derivative image being the same image, according to the displayed image size.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a display unit displaying an image or information on the image, and the display unit displays a derivative image when the user performs a predetermined operation during the display of the original image, and displays derivative images in the order of their image sizes according to the user's operation when a plurality of derivative images generated from the same original image are present.
  • the derivative images are displayed in the order of their image sizes according to the user's operation. This enables the user to accurately decide a magnitude relation of plural images being the same image, according to the display order.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a display unit displaying an image or information on the image, and the display unit, upon deciding the original image as non-display, decides a derivative image generated from this original image as non-display.
  • Structuring the electronic camera in this way can prevent occurrence of a problem that a derivative image of the original image as non-display is displayed. Further, the user need not set non-display twice separately for the original image and its derivative image being the same image, therefore, the user can save his/her labor.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a display unit displaying an image or information on the image, and the display unit discriminates between the original image and the derivative image and does not display the original image and the derivative image concurrently on the screen.
  • the original image and the derivative image being the same image are not displayed together on the same screen, which can prevent the user from being confused because of his/her inability to distinguish the images. Further, the original image and the derivative image being the same image are not displayed at the same time so that many different images can be concurrently displayed. This enables the user to quickly find a target image from various images in a display list.
  • Another electronic camera of the present invention is characterized in that the electronic camera in the above description (1) further includes a slide display unit automatically displaying a plurality of images in sequence, and the slide display unit separates the plurality of images into original images and derivative images to automatically display either of the original images and the derivative images.
  • Structuring the electronic camera in this way can prevent redundant slide displays of the original images and the derivative images being the same image.
  • the user can look through all images in a relatively short time, or he/she can take his/her time as much as he/she wants to look through all images since it is made possible to elongate the display time per frame without elongating the total display time.
  • the transfer unit of the electronic camera in the above description (1) has a function of transferring the original image in addition to a function of transferring the derivative image.
  • This electronic camera further includes a transfer setting unit setting a flag on an image designated by a user's input, the flag indicating a transfer candidate of the transfer unit.
  • the derivative image generating unit of this electronic camera when generating the derivative image from the original image having a flag thereon, removes the flag from this original image and sets the flag on the generated derivative image.
  • Such a structure enables the user to freely select an image to be transferred by performing the following operations ⁇ circle over (1) ⁇ and ⁇ circle over (2) ⁇ .
  • the electronic camera shift the flag from the original image to the derivative image generated in the operation ⁇ circle over (2) ⁇ .
  • the original image continues to have the flag in case where the derivative image is not generated from the original image.
  • Another electronic camera of the present invention is so structured that the transfer unit of the electronic camera in the above description (1) further has a function of transferring the original image in addition to a function of transferring the derivative image.
  • This electronic camera further includes a transfer setting unit setting a flag on an image designated by user's input, the flag indicating a transfer candidate of the transfer unit.
  • the transfer setting unit of this electronic camera when the original image selected by the user's input has its derivative image, sets the flag not on the original image but on the derivative image.
  • Such a structure enables the user to freely select an image to be transferred by performing the following operations ⁇ circle over (3) ⁇ and ⁇ circle over (4) ⁇ .
  • the electronic camera shifts, at the operation ⁇ circle over (4) ⁇ , the flag from the original image to the derivative image generated in the operation.
  • the original image continues to have the flag when the derivative image is not generated from the original image in the operation ⁇ circle over (3) ⁇ .
  • the user can allot the flag to the original image and the derivative image when necessary by performing the operations ⁇ circle over (3) ⁇ and ⁇ circle over (4) ⁇ .
  • Another electronic camera of the present invention is so structured that the transfer unit of the electronic camera in the above description (1) further has a function of transferring the original image in addition to a function of transferring the derivative image.
  • This electronic camera further includes: a transfer setting unit setting a flag on an image designated by user's input, the flag indicating a transfer candidate of the transfer unit; and an erase unit erasing an image designated by a user's input.
  • the transfer setting unit of this electronic camera erases, in response to the erase of the original image, a derivative image generated from this original image, and removes the flag from the derivative image.
  • the user need not remove the flags of remaining derivative images in another time after erasing the original image, and can operate the electronic camera in a simpler manner.
  • Another electronic camera of the present invention is so structured that the transfer unit of the electronic camera in the above description (1) further has a function of transferring the original image in addition to a function of transferring the derivative image.
  • This electronic camera further includes: a transfer setting unit setting a flag on an image designated by user's input, the flag indicating a transfer candidate of the transfer unit; and an erase unit erasing an image designated by user's input.
  • the transfer setting unit of this electronic camera when the derivative image having the flag set thereon is erased, sets the flag on an original image from which the derivative image is generated.
  • Another electronic camera of the present invention is so structured that the transfer unit of the electronic camera in the above description (1) further has a function of transferring the original image in addition to a function of transferring the derivative image.
  • This electronic camera further includes a transfer setting unit setting a flag on an image designated by user's input, the flag indicating a transfer candidate of the transfer unit.
  • the transfer setting unit of this electronic camera sets the flag on all original images with print information, irrespective of whether or not these original images have their derivative images.
  • the original images having print information are likely to be used for printing purpose at their external transfer destinations.
  • the original image having large image information is more preferable in view of image quality than the derivative image with reduced file space.
  • setting the flag on the original images having the print information as described above can surely improve the print image quality at the external transfer destination.
  • FIG. 1( a ) and FIG. 1( b ) are views each showing an external appearance of an electronic camera 11 ;
  • FIG. 2 is a block diagram explaining the configuration of the electronic camera 11 ;
  • FIG. 3 is a flowchart (1/2) explaining a derivative image generating process
  • FIG. 4 is a flowchart (2/2) explaining the derivative image generating process
  • FIG. 5 is a flowchart showing a process routine of file manipulation
  • FIG. 6 is a flowchart showing a derivative image generating process in a second embodiment:
  • FIG. 7 is a flowchart explaining the operation performed in a full screen display mode in a third embodiment
  • FIG. 8 is a flowchart explaining the operation performed in a thumbnail display mode
  • FIG. 9 is a view showing a display screen image in the full screen display mode
  • FIG. 10 is a view showing a display screen image in the thumbnail display mode
  • FIG. 11 is a flowchart explaining the operation performed in a full screen display mode in a fourth embodiment
  • FIG. 12 is a view showing a display screen image in the full screen display mode:
  • FIG. 13 is a flowchart explaining the operation performed in a slide display mode in the fourth embodiment.
  • FIG. 14 is a flowchart explaining the operation performed in a full screen display mode
  • FIG. 15 is a flowchart explaining the operation performed in a thumbnail display mode.
  • FIG. 16 shows thumbnail display.
  • a first embodiment is an embodiment of an electronic camera corresponding to the inventions of claims 1, 4, 5, 7 to 9, 12, and 13.
  • FIG. 1( a ) and FIG. 1( b ) are views each showing an external appearance of this electronic camera 11 .
  • FIG. 1( a ) is a top view of the electronic camera 11
  • FIG. 1( b ) is a rear view of the electronic camera 11
  • FIG. 2 is a block diagram explaining the internal configuration of the electronic camera 11 .
  • a lens 12 is attached to the electronic camera 11 .
  • An image sensor 13 is disposed in an image space of this lens 12 .
  • This image sensor 13 is controlled by a timing generator 13 a and captures a subject.
  • the image captured by this image sensor 13 (namely, an original image) is digitized by an image processing unit 14 and an A/D converting unit 15 , and thereafter, given to a digital signal processor (hereinafter, referred to as a DSP) 16 .
  • This DSP 16 is connected to a buffer memory 1 8 and a memory card 19 via a data bus 17 .
  • the DSP 16 performs two-dimensional image processing, image compression processing, and so on for the original image while exchanging image data with this buffer memory 18 .
  • the original image processed in the DSP 16 is recorded on the memory card 19 in an EXIF file format.
  • timing generator 13 a image processing unit 14 , DSP 16 , buffer memory 18 , and memory card 19 are connected to a microprocessor (hereinafter, referred to as an MPU) 21 via a system bus 20 for control and data transfer.
  • MPU microprocessor
  • a release button 22 To this MPU 21 , connected are a release button 22 , a cross button 23 , a menu button 24 , a command dial 25 , a zoom button 26 , a display switch button 27 , a transfer button 28 , a derivative image generating button 29 , an enter key 29 a , and an erase button 29 b.
  • the aforesaid cross button 23 is constituted of four-direction keys consisting of an up key 23 a , a down key 23 b , a left key 23 c , and a right key 23 d.
  • a frame memory 30 is connected to the aforesaid system bus 20 .
  • Image data in this frame memory 30 is displayed on a liquid crystal display unit 31 provided on a rear face of the electronic camera 11 .
  • An imaging unit described in the claims corresponds to the image sensor 13 , the timing generator 13 a , the image processing unit 14 , the A/D converting unit 15 , and the DSP 16 .
  • a derivative image generating unit described in the claims corresponds to ‘a derivative image generating function’ of the MPU 21 (or the DSP 16 ).
  • a recording unit described in the claims corresponds to ‘a function of file management of the memory card 19 ’ of the MPU 21 .
  • a transfer unit described in the claims corresponds to the interface 32 .
  • An erase control unit described in the claims corresponds to ‘a function of receiving an erase command for the original image from a user's operation or the like of the cross button 23 ’ of the MPU 21 .
  • a transfer control unit described in the claims corresponds to ‘a function of receiving a file transfer command for an original image from a user's operation or the like of the cross button 23 ’ of the MPU 21 .
  • a protect control unit described in the claims corresponds to ‘a function of receiving a protect command for an original image from a user's operation or the like of the cross button 23 ’ of the MPU 21 .
  • An original image erase control unit described in the claims corresponds to ‘a function of receiving an erase command for only an original image from a user's operation or the like of the cross button 23 ’ of the MPU 21 .
  • a thumbnail generating unit described in the claims corresponds to ‘a function of generating a thumbnail image to append it to a file header of an original image’ of the MPU 21 (or the DSP 16 ).
  • a control unit described in the claims corresponds to ‘a function of erasing from the memory card 19 a derivative image which has been transferred’ of the MPU 21 .
  • FIG. 3 and FIG. 4 are flowcharts explaining a derivative image generating process. Note that this process starts as a part of processes in response to pressing of the down key 23 b .
  • the derivative image generating process will be explained following the steps in FIG. 3 and FIG. 4.
  • Step S 1 When a user presses down the down key 23 b , the MPU 21 first determines a current operation mode of the electronic camera 11 .
  • the MPU 21 shifts its operation to Step S 2 .
  • the MPU 21 shifts its operation to Step S 14 .
  • Step S 2 The MPU 21 determines a current display status of the liquid crystal display unit 31 .
  • the MPU 21 shifts its operation to Step S 14 .
  • Step 3 The MPU 21 obtains information on an available storage space of the memory card 19 .
  • the MPU 21 gives up generating a new derivative image and shifts its operation to Step S 14 .
  • Step S 4 The MPU 21 overlappinly displays the following confirmation menu on a display image on the liquid crystal display unit 31 .
  • Step S 5 The MPU 21 monitors a user's operation to the cross button 23 to receive a selected one of the above options ⁇ circle over (1) ⁇ ) to ⁇ circle over (3) ⁇ .
  • Step S 6 The MPU 21 additionally displays the following confirmation menu on the display image on the liquid crystal display unit 31 .
  • Step S 7 The MPU 21 monitors the user's operation to the cross button 23 to receive the selection and determination of the image size (reduction size) of the derivative image.
  • the MPU 21 uses the image size determined here as a default thereafter. After this operation, the MPU 21 shifts its operation back to Step S 4 .
  • Step S 8 The MPU 21 searches files in the memory card 19 to determine whether or not a derivative image to be generated already exists.
  • the MPU 21 shifts its operation to Step S 9 .
  • Step S 9 The MPU 21 overlappingly displays the following confirmation menu on the display image on the liquid crystal display unit 31 .
  • Step S 10 The MPU 21 monitors the user's operation to the cross button 23 to receive a selected one of the above options ⁇ circle over (1) ⁇ to ⁇ circle over (3) ⁇ .
  • the user hits the right key once, determining selection of the option ⁇ circle over (2) ⁇ .
  • the MPU 21 stops generating a new derivative image to shift its operation to Step S 14 .
  • Step 11 In the case of the reproduction mode, the MPU 21 reads out from the memory card 19 a compressed file of the original image currently displayed on the liquid crystal display unit 31 to store this compressed file in the buffer memory 18 .
  • the DSP 16 expands this compressed file to develop the original image in the buffer memory 18 .
  • the MPU 21 (or the DSP 16 ) performs resolution-conversion on this original image in the buffer memory 18 to have an image of a default image size to generate a derivative image.
  • the DSP 16 compresses this derivative image to, for example, about ⁇ fraction (1/16) ⁇ irrespective of the compressibility of the original image.
  • the MPU 21 copies header information of the original image, appends it to the compressed data of the derivative image to generate a compressed file in the E(IF file format.
  • the MPU 21 replaces an initial letter of a file name “DSCN * * * .jpg” of the original image with a letter (for example, “S” or the like) according to the image size to create a file name of the derivative image.
  • the associations between the original image and the derivative image are made according to the file name rule.
  • the MPU 21 records thus generated file of the derivative image in the same folder as the original image in the memory card 19 .
  • Step S 12 The MPU 21 compares the number of pixels of a thumbnail image appended in the file of the original image with the number of pixels of the derivative image newly generated.
  • the MPU 21 shifts its operation to Step S 13 .
  • Step S 13 The MPU 21 erases the thumbnail image from the file of the original image to reduce a file space of the original image. Thereafter, when the thumbnail image of the original image is required, the derivative image is used as a substitute for the thumbnail image.
  • Step S 14 The MPU 21 calls other process routines which are to be executed when the down key 23 b is pressed down.
  • FIG. 5 is a flowchart showing a process routine of file manipulation.
  • the file manipulation to images will be explained following the steps shown in FIG. 5.
  • Step S 18 The user first switches the mode of the electronic camera 11 to the reproduction mode, and selects on the liquid crystal display unit 31 an original image as an object of the file manipulation.
  • Step S 19 When the original image as the object of the manipulation is selected, the MPU 21 changes the initial letter of the file name of this original image to create the file name of a derivative image. The MPU 21 searches the memory card 19 for the file name of the derivative image and determines whether or not the concerning derivative image exists.
  • Step S 20 Next, the MPU 21 monitors the user's operation to the menu button 24 and the transfer button 28 .
  • Step S 21 When the original image as the object of the manipulation has a derivative image, the MPU 21 transfers this derivative image to a preset external transfer destination via the interface 32 . Upon completion of the transfer operation, the MPU 21 erases from the memory card 19 the derivative image which has been transferred, to thereby increase an available storage space of the memory card 19 .
  • the original image as the object of the manipulation does not have any derivative image
  • the original image is transferred as it is to the external transfer destination via the interface 32 .
  • the MPU 21 completes the file manipulation process routine.
  • Step S 22 The MPU 21 displays a menu screen on the liquid crystal display unit 31 in response to the menu button 24 being pressed down.
  • the user operates the cross button 23 referring to the menu screen on the liquid crystal display unit 31 to input a desired file manipulation command.
  • Step S 23 When the user selects a file erase command to the original image, the MPU 21 shifts its operation to Step S 24 . In other cases, the MPU 21 shifts its operation to Step S 25 .
  • Step S 24 The MPU 21 erases from the memory card 19 the original image as the object of the manipulation. Note that, when the original image as the object of the manipulation has a derivative image, the MPU 21 erases this derivative image together. After such file manipulation, the MPU 21 finishes the file manipulation process routine.
  • Step S 25 When the user selects a file transfer command to the original image, the MPU 21 shifts its operation to Step S 26 . In other cases, the MPU 21 shifts its operation to Step S 27 .
  • Step S 26 The MPU 21 file-transfers the original image as the object of the manipulation to a folder designated by the user. Note that, when the original image as the object of the manipulation has a derivative image, the MPU 21 file-transfers this derivative image together. After such file manipulation, the MPU 21 finishes the file manipulation process routine.
  • Step S 27 When the user selects a protect command for the original image, the MPU 21 shifts its operation to Step S 28 . In other cases, the MPU 21 shifts its operation to Step S 29 .
  • Step S 28 The MPU 21 appends a protect attribute to the file of the original image as the object of the manipulation. Note that, when the original image as the object of the manipulation has a derivative image, the MPU 21 appends the protect attribute to the file of this derivative image as well. After such file manipulation, the MPU 21 finishes the file manipulation process routine.
  • Step S 29 When the user selects an erase command to only the original image, the MPU 21 shifts its operation to Step S 30 . In other cases, the MPU 21 finishes the file manipulation process routine.
  • Step S 30 The MPU 21 erases the file of the original image as the object of the manipulation from the memory card 19 . Note that, when the original image as the object of the manipulation has a derivative image, the MPU 21 changes the file name of this derivative image to the file name of the original image, thereby upgrading the derivative image to the original image. After such file manipulation, the MPU 21 finishes the file manipulation process routine.
  • a new derivative image for transfer is generated by reducing the resolution of the original image.
  • the MPU 21 changes the initial letter “D” of the file name of the original image to the initial letter “S” or the like for the derivative image to generate the file name of the derivative image.
  • the original image and the derivative image are recorded on the memory card 19 in such a manner that both the images get associated with each other by the file name rule.
  • the derivative image is erased in response to the completion of the external transfer of the derivative image. This eliminates a problem that the derivative image that has been transferred continues to remain in the electronic camera and occupies the memory space of the memory card 19 .
  • the protect setting (erase prevention setting) of the original image
  • the protect setting is set on its corresponding derivative image. Therefore, the user need not set the protect setting separately on the original image and on the derivative image, which makes it possible to save his/her time and labor.
  • the thumbnail image is erased from the file of the original image. This can reduce the file size of the original image by the file size of the thumbnail image.
  • a second embodiment describes an electronic camera corresponding to the inventions of claims 1 to 13. Note that the configuration of the electronic camera in the second embodiment is the same as that in the first embodiment (FIG. 1 and FIG. 2), and therefore, the configuration description thereof will be omitted here. Further, description on the operations similar to those of the first embodiment (file manipulation to the images, suspension of thumbnail image appending, and so on) will be omitted here in order to avoid repetition.
  • An imaging unit described in the claims corresponds to an image sensor 13 , a timing generator 13 a , an image processing unit 14 , an A/D converting unit 15 , and a DSP 16 .
  • a derivative image generating unit described in the claims corresponds to ‘a function of generating a derivative image’ of an MPU 21 (or the DSP 16 ).
  • a recording unit described in the claims corresponds to ‘a function of file management of a memory card 19 ’ of the MPU 21 .
  • a transfer unit described in the claims corresponds to an interface 32 .
  • a storage space monitoring unit described in the claims corresponds to ‘a function of monitoring an available storage space of the memory card 19 ’ of the MPU 21 .
  • a control unit described in the claims corresponds to ‘a function of erasing from the memory card 19 a derivative image which has been transferred’ of the MPU 21 .
  • FIG. 6 is a flowchart showing a derivative image generating process characterizing the second embodiment.
  • Step S 40 A user first operates a cross button 23 , similarly to the first embodiment, to give a derivative image generating command to the MPU 21 .
  • Step S 41 The MPU 21 obtains information on an available storage space of the memory card 19 .
  • Step S 42 The MPU 21 determines whether or not the available storage space of the memory card 19 is large enough to store a derivative image.
  • Step S 43 The MPU 21 erases from the memory card 19 a part or all of existing derivative images to secure a memory space in the memory card 19 .
  • Step S 44 The MPU 21 communicates with an external transfer destination via the interface 32 to obtain information on the external transfer destination (incidentally, information on what kind of device the external transfer destination is may also be obtained through a user's input).
  • Step S 45 The MPU 21 determines an image format (for example, image size, a screen aspect ratio, the number of colors, and so on) of the derivative image appropriate for the external transfer destination in accordance with the information on the external transfer destination.
  • image format for example, image size, a screen aspect ratio, the number of colors, and so on
  • Step S 46 The MPU 21 determines the type of an original image from which the derivative image is generated.
  • the MPU 21 shifts its operation to Step S 49 .
  • Step S 47 The MPU 21 converts the original image (the one-frame static image here) to the image format determined in Step S 45 to generate the derivative image. After this operation, the MPU 21 shifts its operation to Step S 50 .
  • Step S 48 The MPU 21 extracts a first frame of the original image (the moving images here).
  • the MPU 21 converts this first frame into the image format determined in Step S 45 to generate the derivative image. After this operation, the MPU 21 shifts its operation to Step S 50 .
  • Step S 49 The MPU 21 converts each frame of the original image (the plural static images here) into the image format determined in Step S 45 to generate the plural derivative images. After this operation, the MPU 21 shifts its operation to Step S 50 .
  • Step S 50 The MPU 21 determines whether or not a lower folder corresponding to the image size of the derivative image exists in a folder of the original image.
  • Step S 51 The MPU 21 makes a lower folder exclusively for the image size of the derivative image under a hierarchy of the original image folder in the memory card 19 .
  • Step S 52 The MPU 21 stores a file of the derivative image in the lower folder exclusively for the image size.
  • the lower folder is made for each image size of the derivative image in the folder of the original image, and the derivative images are stored therein, being classified by the image size. This enables efficient image management of the original images and the derivative images based on the hierarchical folders.
  • the image format appropriate for the external transfer destination is determined based on the information on the external transfer destination, and the derivative image is generated so as to conform to the image format. Consequently, the user need not change the image format or the like for every external transfer destination. Moreover, a suitable derivative image for the external transfer destination can be surely generated.
  • all or a part of the derivative images are erased when the memory card 19 does not have a sufficient available storage space.
  • a shortage in the available storage space is compensated by the file space of the erased derivative images, so that it is made possible to increase the number of recordable frames of the electronic camera with efficiency.
  • a third embodiment is an embodiment of an electronic camera corresponding to the inventions of claims 14 and 18.
  • An imaging unit described in the claims corresponds to an image sensor 13 , a timing generator 13 a , an image processing unit 14 , an A/D converting unit 15 , and a DSP 16 .
  • a derivative image generating unit described in the claims corresponds to ‘a function of generating a derivative image’ of an MPU 21 (or the DSP 16 ).
  • a transfer unit described in the claims corresponds to an interface 32 .
  • a display unit described in the claims corresponds to the MPU 21 and a liquid crystal display unit 31 .
  • FIG. 7 is a flowchart explaining the operation performed in a full screen display mode in the third embodiment. Hereinafter, the operation in the full screen display mode will be explained following the steps in FIG. 7.
  • Step S 101 A user turns a command dial 25 first to select a reproduction mode. The user further operates a display switch button 27 as required to select the full screen display mode.
  • the MPU 21 selects a frame number for the full screen display.
  • the MPU 21 selects the last frame number (in other words, a frame number captured most recently) as the frame number for the full screen display.
  • the MPU 21 selects a most recently reproduced frame number as the frame number for the full screen display.
  • Step S 102 The MPU 21 generates a file name of an original image corresponding to the selected frame number based on the selected frame number and a file name rule.
  • the MPU 21 inserts the frame number in the serial number “ * * * ” to generate the file name of the original image.
  • Step S 103 The MPU 21 reads out a compressed file of the original image from a memory card 19 based on the generated file name and stores this compressed file in a buffer memory 18 . After expanding this compressed file, the DSP 16 converts the resolution thereof according to the screen size of the liquid crystal display unit 31 and stores this converted file in a frame memory 30 . The liquid crystal display unit 31 displays on the full screen the original image (the one converted in accordance with the screen size of a monitor screen) in this frame memory 30 .
  • Step S 104 The MPU 21 determines whether or not the displayed original image has a derivative image for transfer.
  • the MPU 21 changes an initial letter of the file name of the original image from “D” to “S” to generate a file name of the derivative image.
  • the MPU 21 searches the memory card 19 for this file name of the derivative image to determine whether or not the original image has the derivative image.
  • the MPU 21 shifts its operation to Step S 105 .
  • Step S 105 The MPU 21 overlappingly displays an information display indicating that “a derivative image exists” as shown in FIG. 9 on the liquid crystal display unit 31 via the frame memory 30 .
  • the MPU 21 shifts its operation to Step S 106 .
  • Step S 106 The MPU 21 waits for a user's key operation with this full screen display on (FIG. 9).
  • Step S 107 If the right key 23 d is pressed down here, the MPU 21 cyclically moves the frame number for the full screen display one forward.
  • the MPU 21 cyclically moves the frame number for the full screen display one backward.
  • the MPU 21 shifts its operation back to Step S 102 .
  • Step S 108 The MPU 21 displays the following confirmation menu overlappingly on a display image on the liquid crystal display unit 31 .
  • Step S 109 The MPU 21 monitors the user's operation to a cross button 23 to receive the selection from the above options ⁇ circle over (1) ⁇ to ⁇ circle over (3) ⁇ .
  • the user hits the right key 23 d once after hitting the down key 23 b twice, determining the selection of the option ⁇ circle over (3) ⁇ .
  • the MPU 21 shifts its operation to Step S 110 .
  • Step S 110 The MPU 21 additionally displays the following confirmation menu on the display image on the liquid crystal display unit 31 .
  • Step S 111 The MPU 21 monitors the user's operation to the cross button 23 to receive the selection of the image size (reduction size) of the derivative image.
  • the MPU 21 uses the image size selected here as a default thereafter. After this operation, the MPU 21 shifts its operation back to Step S 108 .
  • Step S 112 The MPU 21 reads out from the memory card 19 the compressed file of the original image currently displayed on the liquid crystal display unit 31 to store this compressed file in the buffer memory 18 .
  • the DSP 16 expands this compressed file to develop the original image in the buffer memory 18 (incidentally, when the expanded image in Step S 103 still exists in the buffer memory 18 , this expanded image is preferably used to omit the original image expanding operation).
  • the MPU 21 (or the DSP 16 ) converts the resolution of the original image in this buffer memory 18 to the default image size to generate a derivative image.
  • the DSP 16 compresses this derivative image to, for example, about ⁇ fraction (1/16) ⁇ irrespective of the compressibility of the original image.
  • the MPU 21 copies header information of the original image and appends it to compressed data of the derivative image to generate a compressed file in an EXIF format.
  • the MPU 21 replaces the initial letter of the file name “DSCN * * * .jpg” of the original image with a letter (for example, “S” or the like) according to the image size, and the resultant file name is defined as a file name of the derivative image.
  • the MPU 21 records the file of thus completed derivative image in the same folder as the original image in the memory card 19 .
  • the MPU 21 shifts its operation back to Step S 106 .
  • FIG. 8 is a flowchart explaining the operation performed in a thumbnail display mode.
  • Step S 121 The user turns the command dial 25 first to select the reproduction mode. The user further operates the display switch button 27 if necessary to select the thumbnail display mode.
  • the MPU 21 decides a frame number at a focus position (an original image for focus selected from a group of thumbnail-displayed images).
  • the MPU 21 selects the last frame number (namely, a frame number most recently captured) as the frame number at the focus position.
  • the MPU 21 selects a most recently reproduced frame number as the frame number at the focus position.
  • Step S 122 Based on the selected frame number and the file name rule, file names of the group of the original images for the thumbnail display are generated.
  • Step S 123 The MPU 21 retrieves these file names from the memory card 19 and sequentially reads out the thumbnail images each stored in a header of each file.
  • the MPU 21 displays these thumbnail images as a list on the liquid crystal display unit 31 via the frame memory 30 .
  • Step S 124 The MPU 21 determines whether or not each of the original images on the screen has a derivative image based on the file name rule.
  • the MPU 21 displays information indicating that “a derivative image exists” on the thumbnail image corresponding to the original image having the derivative image, as shown in FIG. 10.
  • Step S 125 The MPU 21 waits for a user's key operation with this thumbnail display on.
  • Step S 126 If the user presses down the derivative image generating button 29 here, the MPU 21 shifts its operation to Step S 126 .
  • Step S 126 In case where the derivative image generating button 29 is pressed down here, the MPU 21 displays a derivative image generation mark on each of the thumbnail images at the focus positions, as shown in FIG. 10. Further, the MPU 21 adds the frame number of this focus position in a derivative image generation schedule list which is prepared on an internal memory. After this operation, the MPU 21 shifts its operation back to Step S 125 .
  • Step S 127 The MPU 21 determines the user's operation to the cross button 23 .
  • Step S 128 If the user presses the down key 23 b down here, the MPU 21 shifts its operation to Step S 128 .
  • Step S 128 The MPU 21 searches for the derivative image of the original image at the focus position, and displays as information image size of this derivative image on the thumbnail image at the focus position (refer to FIG. 10).
  • the MPU 21 displays the image sizes of the derivative images in sequence every time the down key 23 b is pressed down.
  • the MPU 21 shifts its operation back to Step S 125 .
  • Step S 129 When the right key 23 d is pressed down, the MPU 21 moves the focus position forward by one frame.
  • Step S 130 In accordance with such shift in the focus position, the MPU 21 determines whether or not the focus position shifts to the outside of a thumbnail display range.
  • Step S 131 When the enter key 29 a is pressed down, the MPU 21 overlappingly displays the following confirmation menu on the liquid crystal display unit 31 .
  • Step S 132 The MPU 21 monitors the user's operation to the cross button 23 to receive the selection from the above options ⁇ circle over (1) ⁇ to ⁇ circle over (3) ⁇ .
  • Step S 133 The MPU 21 additionally displays the following confirmation menu on the display image on the liquid crystal display unit 31 .
  • Step S 134 The MPU 21 monitors the user's operation to the cross button 23 to receive the selection of the image size (reduction size) of the derivative image.
  • the MPU 21 uses the image size selected here as a default thereafter. After this operation, the MPU 21 shifts its operation back to Step S 131 .
  • Step S 135 The MPU 21 sequentially generates the derivative images from the original images with the generation mark (the original images listed in the derivative image generation schedule list) and sequentially records these derivative images in the memory card 19 .
  • the original image and the derivative image are discriminated based on the file name rule and only the original image is displayed on the liquid crystal display unit 31 . This makes it possible to surely prevent the user from being confused at image management since there is no case where the original image and the derivative image being the same image are displayed together.
  • a fourth embodiment is an embodiment of an electronic camera corresponding to the inventions of claims 15 to 19.
  • An imaging unit described in the claims corresponds to an image sensor 13 , a timing generator 13 a , an image processing unit 14 , an A/D converting unit 15 , and a DSP 16 .
  • a derivative image generating unit described in the claims corresponds to ‘a function of generating a derivative image’ of an MPU 21 (or the DSP 16 ).
  • a transfer unit described in the claims corresponds to an interface 32 .
  • a display unit described in the claims corresponds to the MPU 21 and a liquid crystal display unit 31 .
  • a slide display unit described in the claims corresponds to the MPU 21 and the liquid crystal display unit 31 .
  • FIG. 11 is a flowchart explaining the operation performed in a full screen display mode in the fourth embodiment.
  • the same step numbers are assigned to the same operations as those in the third embodiment (FIG. 7), and repeated description thereof will be omitted here.
  • Step S 141 The MPU 21 reads out from a memory card 19 a file property of an original image which is to be displayed, and determines whether or not this original image is set as non-display.
  • the MPU 21 shifts its operation to Step S 103 .
  • Step S 142 The MPU 21 cyclically moves a frame number which is to be displayed, by one frame forward and so controls that the original image (and a derivative image) set as non-display is not displayed on the screen. After this operation, the MPU 21 shifts its operation back to Step S 102 .
  • Step S 143 When a down key 23 b is pressed down in Step S 106 , the MPU 21 replaces an initial letter of a file name “DSCN * * * .jpg” of the original image with a letter (for example, “S” or the like) according to the image size to generate a file name of the derivative image.
  • the MPU 21 searches the memory card 19 for this derivative image. Upon finding this derivative image, the MPU 21 reads out this derivative image from the memory card 19 , and displays a display 42 of this derivative image overlappingly on a full screen display 41 of the original image, as shown in FIG. 12. At this time, the MPU 21 also displays an icon 43 as information showing the image size of this derivative image.
  • FIG. 12 shows a state in which the plural derivative images are displayed by this operation in a nesting way.
  • FIG. 13 is a flowchart explaining the operation performed in a slide display mode in the fourth embodiment. Hereinafter, the operation in the slide display mode will be explained following the steps in FIG. 13.
  • Step S 161 A user first turns a command dial 25 to select a reproduction mode. The user further operates a display switch button 27 as required to select the slide display mode.
  • the MPU 21 selects an initial frame number of slide display from the memory card 19 , and substitutes this frame number in a frame number N.
  • Step S 162 A file name of the original image corresponding to the frame number N is generated based on the frame number N and a file name rule.
  • the MPU 21 inserts the frame number in the serial number “ * * * ” to generate the file name of the original image.
  • Step S 163 The MPU 21 obtains information on a file property from the memory card 19 based on the generated file name of the original image and determines whether or not the original image is set as non-display.
  • the MPU 21 shifts its operation to Step S 164 .
  • the MPU 21 shifts its operation to Step S 165 .
  • Step S 164 The MPU 21 moves the frame number to be displayed by one frame forward cyclically and so controls that the original image set as non-display is not displayed on the screen. After this operation, the MPU 21 shifts its operation back to Step S 162 .
  • Step S 165 The MPU 21 reads out a compressed file of the original image from the memory card 19 based on the generated file name of the original image and stores this compressed file in a buffer memory 18 . After expanding this compressed file, the DSP 16 converts the resolution thereof according the screen size of the liquid crystal display unit 31 and stores the converted file in a frame memory 30 . The liquid crystal display unit 31 displays the original image (the one converted according to the screen size of a monitor screen) stored in this frame memory 30 .
  • Step S 166 The MPU 21 determines whether or not the original image on display has a derivative image for transfer.
  • Step S 167 The MPU 21 overlappingly displays an information display indicating that “a derivative image exists” on the liquid crystal display unit 31 via the frame memory 30 . After such information display, the MPU 21 shifts its operation to Step S 168 .
  • Step S 168 The MPU 21 waits for the elapse of a slide display time corresponding to one frame and shifts its operation to Step S 169 .
  • Step S 169 The MPU 21 determines whether or not the current frame number N is the last frame number in the memory card 19 .
  • the information display on the image size of the derivative image is displayed as shown in FIG. 12. This enables a user to appropriately distinguish the original image and the derivative image being the same image based on the information on the image size.
  • the derivative images are displayed in the descending order of the image size.
  • the user can appropriately distinguish the original image and the derivative image based on the display order.
  • the derivative image when the original image is set as non-display, the derivative image is also set as non-display together with the original image. Therefore, the user need not separately set the derivative image as non-display, which can save the user's time and labor.
  • the original image and the derivative image are discriminated based on the file name rule and only the original image is displayed in the slide display mode. Therefore, the original image and the derivative image being the same image are not redundantly and repeatedly displayed, which enables the user to look through a series of images in as short a time as possible.
  • a fifth embodiment is an embodiment of an electronic camera corresponding to the inventions of claims 20 to 24.
  • An imaging unit described in the claims corresponds to an image sensor 13 , a timing generator 13 a , an image processing unit 14 , an A/D converting unit 15 , and a DSP 16 .
  • a derivative image generating unit described in the claims corresponds to “a function of generating a derivative image” of an MPU 21 (or the DSP 16 ).
  • a transfer setting unit described in the claims corresponds to ‘a function of setting a flag on an image’ of the MPU 21 .
  • a transfer unit described in the claims corresponds to an interface 32 .
  • An erase unit described in the claims corresponds to “a function of erasing an image in a memory card 19 ” of the MPU 21 .
  • FIG. 14 is a flowchart explaining the operation performed in a full screen display mode in the fifth embodiment. Hereinafter, the operation in the full screen display mode will be explained following the steps in FIG. 14.
  • Step S 201 A user first turns a command dial 25 of an electronic camera 11 to select a reproduction mode. The user further operates a display switch button 27 as required to select the full screen display mode.
  • the MPU 21 selects a frame number of an image for the full screen display.
  • the MPU 21 selects the last frame number (namely, a frame number most recently captured) as the frame number for the full screen display.
  • the MPU 21 selects a most recently reproduced frame number as the frame number for the full screen display.
  • Step S 202 The MPU 21 generates a file name of an original image corresponding to the selected frame number based on the selected frame number and a file name rule.
  • the MPU 21 inserts the frame number in place of the serial number “ * * * ” to generate the file name of the original name.
  • Step S 203 The MPU 21 reads out a compressed file of the original image from the memory card 19 based on the generated file name and stores this compressed file in a buffer memory 18 . After expanding this compressed file, the DSP 16 converts the resolution according to the screen size of a liquid crystal display unit 31 , and stores this converted file in a frame memory 30 . The liquid crystal display unit 31 displays on the full screen the original image (the one converted in accordance with the screen size of a monitor screen) stored in this frame memory 30 .
  • Step S 204 With this full screen display, the MPU 21 determines a key operation to a cross button 23 by a user.
  • the MPU 21 shifts its operation to Step S 208 .
  • Step S 205 When the right key 23 d is pressed down, the MPU 21 moves the frame number for the full screen display one forward cyclically.
  • the MPU 21 moves the frame number for the full screen display one backward cyclically.
  • the MPU 21 shifts its operation back to Step S 202 .
  • Step S 206 The MPU 21 determines whether or not the original image on display has a derivative image.
  • the MPU 21 changes an initial letter of the file name of the original image from “D” to “S” to generate a file name of the derivative image.
  • the MPU 21 searches the memory card 19 for this file name of the derivative image, thereby judging whether or not the original image has the derivative image.
  • the MPU 21 shifts its operation to Step S 207 .
  • Step S 207 The MPU 21 reads out from the memory card 19 the derivative image which is generated from the original image on display.
  • the MPU 21 displays a display 42 of this derivative image overlappingly on a full screen display 41 of the original image, as shown in FIG. 12.
  • the MPU 21 also displays as information an icon 43 indicating the image size of this derivative image together.
  • FIG. 12 shows a state in which the plural derivative images are displayed by this operation in a nesting way.
  • the MPU 21 shifts its operation back to Step S 204 .
  • Step S 208 Further, the MPU 21 determines other user's key operations.
  • the MPU 21 shifts its operation to Step S 221 .
  • Step S 209 The MPU 21 determines whether or not the original image on display has a derivative image.
  • the MPU 21 shifts its operation to Step S 210 .
  • Step S 210 The MPU 21 determines whether or not the original image on display has any print information (specification of a frame to be printed, the number of sheets to be printed, and so on) specified in DPOF (abbreviation of Digital Print Order Format) and the like.
  • DPOF abbreviation of Digital Print Order Format
  • the MPU 21 shifts its operation to Step S 211 .
  • Step S 211 The MPU 21 sets a flag on the original image on display. This flag is set in such a manner, for example, that the MPU 21 writes information indicating a transfer candidate in a header or the like of an image file. Another example of how the flag is set is that the MPU 21 adds an identifier (file name or the like) of the image to a transfer candidate list on an internal memory.
  • the MPU 21 shifts its operation back to Step S 204 .
  • Step S 212 The MPU 21 sets the flag not on the original image on display but on the derivative image that the original image has.
  • the MPU 21 shifts its operation back to Step S 204 .
  • Step S 213 The MPU 21 determines whether or not the derivative image is displayed on the screen.
  • Step S 214 The MPU 21 erases the original image on display from the memory card 19 .
  • Step S 215 The MPU 21 determines whether or not the erased original image had a derivative image.
  • the MPU 21 shifts its operation to Step S 217 .
  • Step S 216 The MPU 21 erases the derivative image that the original image had. Further, when the flag has been set on this derivative image, the MPU 21 removes the flag.
  • Step S 217 The MPU 21 moves the frame number of the original image to be displayed by one frame backward in accordance with the erase of the original image. Thereafter, the MPU 21 shifts its operation back to Step S 202 and updates the full screen display.
  • Step S 218 The MPU 21 determines whether or not a flag is set on the derivative image displayed on the utmost front window of the screen.
  • Step S 219 The MPU 21 sets the flag on the original image from which this derivative image is generated. Note that when one original image has a plurality of derivative images, the MPU 21 sets the flag on a derivative image having the second largest image size next to the derivative image displayed on the utmost front window.
  • Step S 220 The MPU 21 erases from the memory card 19 the derivative image displayed on the utmost front window. Further, in a case where this derivative image has a flag, the MPU 21 removes the flag at the same time.
  • the MPU 21 shifts its operation back to Step S 202 and updates the full screen display.
  • Step S 221 The MPU 21 determines a key operation to a derivative image generating button 29 by a user.
  • Step S 222 The MPU 21 reads out from the memory card 19 the compressed file of the original image currently displayed and stores this compressed file in the buffer memory 18 .
  • the DSP 16 expands this compressed file to develop the original image stored in the buffer memory 18 (incidentally, when the expanded image in Step S 203 still exists in the buffer memory 18 , it is preferable to use this image, thereby omitting the original image expanding operation).
  • the MPU 21 (or the DSP 16 ) converts the resolution of this original image in the buffer memory 18 to generate a derivative image.
  • the DSP 16 compresses this derivative image to, for example, about ⁇ fraction (1/16) ⁇ irrespective of the compressibility of the original image.
  • the MPU 21 copies header information of the original image and appends it to compressed data of the derivative image to generate a compressed file in an EXIF format.
  • the MPU 21 replaces the initial letter of the file name “DSCN * * * .jpg” of the original image with a letter (for example, “S” or the like) according to the image size to generate a file name of the derivative image.
  • the MPU 21 records thus generated file of the derivative image in the same folder as the original image in the memory card 19 .
  • Step S 223 The MPU 21 determines whether or not the flag is set on the original image currently on display.
  • Step S 224 The MPU 21 removes the flag on the original image currently on display, and sets the flag on a newly generated derivative image.
  • the MPU 21 shifts its operation back to Step S 204 .
  • FIG. 15 is a flowchart explaining the operation performed in a thumbnail display mode.
  • Step S 241 The user first turns the command dial 25 of the electronic camera 11 to select the reproduction mode. The user further operates the display switch button 27 as required to select the thumbnail display mode.
  • the MPU 21 determines a frame number of a focus position (an original image selected for focusing among a group of images displayed in the thumbnail display mode).
  • the MPU 21 selects the last frame number (that is, a frame number most recently captured) as the frame number of the focus position.
  • the MPU 21 selects a most recently reproduced frame number as the frame number of the focus position.
  • Step S 242 The MPU 21 generates file names of a group of original images for the thumbnail display in sequence based on the selected frame number and the file name rule.
  • Step S 243 The MPU 21 retrieves these file names from the memory card 19 and sequentially reads out thumbnail images stored in a header or the like of each file.
  • the MPU 21 stores these thumbnail images in the frame memory 30 , and displays these thumbnail images as a list on the liquid crystal display unit 31 , as shown in FIG. 16. At this time, the image at the focus position is highlighted (using a dotted frame or the like as shown in FIG. 16).
  • Step S 244 The MPU 21 determines whether or not the original image on the screen has a derivative image based on the file name rule. As for the original image having the derivative image, the MPU 21 displays information indicating that “a derivative image exists” on a corresponding thumbnail image, as shown in FIG. 16.
  • Step S 245 The MPU 21 determines the user's key operation to the cross button 23 in this thumbnail display state.
  • the MPU 21 shifts its operation to Step S 249 .
  • Step S 246 The MPU 21 retrieves the derivative image of the original image at the focus position, and displays information on the image size of this derivative image on the thumbnail image at the focus position (refer to FIG. 16).
  • the MPU 21 displays the image sizes of the derivative images in the descending order every time the down key 23 b is pressed down.
  • the MPU 21 shifts its operation back to Step S 245 .
  • Step S 247 When the right key 23 d is pressed down, the MPU 21 moves the focus position by one frame forward.
  • Step S 248 In accordance with such shift of the focus position, the MPU 21 performs scroll shifting of a thumbnail view so as to keep the focus position within the screen.
  • the MPU 21 shifts its operation back to Step S 245 .
  • Step S 249 The MPU 21 further determines a user's operation to other keys.
  • the MPU 21 shifts its operation to Step S 252 .
  • Step S 250 When the derivative image generating button 29 is thus pressed down, the MPU 21 displays a derivative image generation mark on the thumbnail image at the focus position. Further, the MPU 21 adds the frame number of this focus position to a derivative image generation schedule list which is prepared on the internal memory. After this operation, the MPU 21 shifts its operation back to Step S 245 .
  • Step S 251 When the erase button 29 b is pressed down here, the MPU 21 displays a derivative image erase mark on the thumbnail image at the focus position. Further, the MPU 21 adds the frame number of this focus position to a derivative image erase schedule list which is prepared on the internal memory. After this operation, the MPU 21 shifts its operation back to Step S 245 .
  • Step 252 The MPU 21 further determines the user's operation to other keys.
  • the MPU 21 shifts its operation back to Step S 245 .
  • Step S 253 The MPU 21 determines whether or not the original image at the focus position has a derivative image.
  • Step S 254 The MPU 21 determines whether or not the original image at the focus position has any print information (specification of a frame to be printed, the number of sheets to be printed, and so on) which is specified in DPOF (abbreviation of Digital Print Order Format) or the like.
  • DPOF abbreviation of Digital Print Order Format
  • the MPU 21 shifts its operation to Step S 255 .
  • the MPU 21 shifts its operation to Step S 256 .
  • Step S 255 The MPU 21 sets the flag on the original image at the focus position.
  • the MPU 21 shifts its operation back to Step S 245 .
  • Step S 256 The MPU 21 sets the flag not on the original image at the focus position but on the derivative image that this original image has.
  • Step S 257 The MPU 21 selects the original image with the derivative image erase mark (the original image listed in the derivative image generation schedule list) and erases this original image together with the derivative image. Note that when the derivative image has the flag, the MPU 21 removes this flag as well.
  • Step S 258 The MPU 21 selects the original images with the derivative image generation mark (the original images listed in the derivative image generation schedule list) to generate the derivative images in sequence and records them in sequence on the memory card 19 . Note that when the original image has the flag, the MPU 21 removes the flag from the original image and sets the flag on a newly generated derivative image.
  • the derivative image generation mark the original images listed in the derivative image generation schedule list
  • the user first connects the interface 32 of the electronic camera 11 to an external transfer destination via an appropriate transfer route (a cable, a wireless LAN, an Internet terminal, and the like).
  • an appropriate transfer route a cable, a wireless LAN, an Internet terminal, and the like.
  • the MPU 21 waits for a user's operation to a transfer button 28 according to such a transfer mode.
  • the MPU 21 selects a file of an image having the flag, and transfers this image to the external transfer destination according to a predetermined protocol.
  • the electronic camera 11 removes the flag from the original image and sets the flag on the derivative image (refer to Steps S 222 to S 224 in FIG. 14 and Step 258 in FIG. 15).
  • the electronic camera 11 does not set the flag on this original image but sets the flag on the derivative image (refer to Steps S 209 to S 212 in FIG. 14 and Steps S 253 to S 256 in FIG. 15).
  • the derivative image generated from this original image is erased, and further, the flag on this derivative image is also removed (refer to Steps S 214 to S 216 in FIG. 14 and Step S 257 in FIG. 15). Consequently, the removal of the flag of the derivative image and the erase of the derivative image can be carried out at the same time by only a single operation of erasing the original image. As a result, unnecessary image files in the memory card 19 can be easily erased.
  • the flag when the derivative image having the flag is erased, the flag is returned to the original image from which the derivative image is generated (refer to Steps S 218 to S 220 in FIG. 14). Therefore, the user only needs to erase the derivative image when the user intends to transfer the original image instead of the derivative image with the flag. In this case, the flag need not be newly set on the original image, which makes it possible to facilitate the operation of the electronic camera 11 .
  • the flag is set on the original image irrespective of existence or nonexistence of the derivative image (refer to Steps S 210 to S 211 in FIG. 14 and Steps S 254 to S 255 in FIG. 15).
  • the original image is more suitable than the derivative image in view of image quality because the original image has abundant image information compared to the derivative image with reduced data capacity.
  • the original image is preferentially given the flag even when it has derivative images. This results in enhancing the print image quality with reliability when the images are used for printing purpose at the external transfer destination.
  • the resolution of the original image is reduced to generate the derivative image.
  • the present invention is not to be limited thereto.
  • the derivative image is generated by reducing the color of the original image.
  • the use of the file name rule and the hierarchical folders establishes the associations between the original image and the derivative image.
  • the present invention is not to be limited thereto.
  • the file associations between the original image and the derivative image may be recorded by using data such as header information of files and file management information on a recording medium.
  • the original image and the derivative image may be discriminated by use of, for example, header information of files, file management information, image size, or the like.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Signal Processing For Recording (AREA)
  • Studio Devices (AREA)
US10/380,328 2001-07-13 2002-07-12 Electronic camera Abandoned US20040051784A1 (en)

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JP2001213524A JP4608824B2 (ja) 2001-07-13 2001-07-13 電子カメラ
JP2001-213524 2001-07-13
JP2001216814A JP4608825B2 (ja) 2001-07-17 2001-07-17 電子カメラ
JP2001-216814 2001-07-17
JP2001-245954 2001-08-14
JP2001245954A JP4356272B2 (ja) 2001-08-14 2001-08-14 電子カメラ
PCT/JP2002/007111 WO2003007599A1 (fr) 2001-07-13 2002-07-12 Camera electronique

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US12/929,010 Expired - Lifetime US8547469B2 (en) 2001-07-13 2010-12-22 Electronic camera

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WO2003007599A1 (fr) 2003-01-23
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DE60233667D1 (de) 2009-10-22
EP1429553A1 (de) 2004-06-16
US8547469B2 (en) 2013-10-01
US20110096199A1 (en) 2011-04-28
EP1429553B1 (de) 2009-09-09
US20090009629A1 (en) 2009-01-08

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